ntoskrnl/mm/ARM3/largepag.c

   1 /*
   2  * PROJECT:         ReactOS Kernel
   3  * LICENSE:         BSD - See COPYING.ARM in the top level directory
   4  * FILE:            ntoskrnl/mm/ARM3/largepag.c
   5  * PURPOSE:         ARM Memory Manager Large Page Support
   6  * PROGRAMMERS:     ReactOS Portable Systems Group
   7  */
   8
   9 /* INCLUDES *******************************************************************/
  10
  11 #include <ntoskrnl.h>
  12 #define NDEBUG
  13 #include <debug.h>
  14
  15 #define MODULE_INVOLVED_IN_ARM3
  16 #include <mm/ARM3/miarm.h>
  17
  18 /* GLOBALS ********************************************************************/
  19
  20 LIST_ENTRY MmProcessList;
  21 PMMPTE MiLargePageHyperPte;
  22 ULONG MiLargePageRangeIndex;
  23 MI_LARGE_PAGE_RANGES MiLargePageRanges[64];
  24 WCHAR MmLargePageDriverBuffer[512] = {0};
  25 ULONG MmLargePageDriverBufferLength = -1;
  26 LIST_ENTRY MiLargePageDriverList;
  27 BOOLEAN MiLargePageAllDrivers;
  28
  29 /* FUNCTIONS ******************************************************************/
  30
  31 CODE_SEG("INIT")
  32 VOID
  33 NTAPI
  34 MiInitializeLargePageSupport(VOID)
  35 {
  36 #if _MI_PAGING_LEVELS > 2
  37     DPRINT1("MiInitializeLargePageSupport: PAE/x64 Not Implemented\n");
  38     //ASSERT(FALSE);
  39 #else
  40     /* Initialize the large-page hyperspace PTE used for initial mapping */
  41     MiLargePageHyperPte = MiReserveSystemPtes(1, SystemPteSpace);
  42     ASSERT(MiLargePageHyperPte);
  43     MiLargePageHyperPte->u.Long = 0;
  44
  45     /* Initialize the process tracking list, and insert the system process */
  46     InitializeListHead(&MmProcessList);
  47     InsertTailList(&MmProcessList, &PsGetCurrentProcess()->MmProcessLinks);
  48 #endif
  49 }
  50
  51 CODE_SEG("INIT")
  52 VOID
  53 NTAPI
  54 MiSyncCachedRanges(VOID)
  55 {
  56     ULONG i;
  57
  58     /* Scan every range */
  59     for (i = 0; i < MiLargePageRangeIndex; i++)
  60     {
  61         UNIMPLEMENTED_DBGBREAK("No support for large pages\n");
  62     }
  63 }
  64
  65 CODE_SEG("INIT")
  66 VOID
  67 NTAPI
  68 MiInitializeDriverLargePageList(VOID)
  69 {
  70     PWCHAR p, pp;
  71
  72     /* Initialize the list */
  73     InitializeListHead(&MiLargePageDriverList);
  74
  75     /* Bail out if there's nothing */
  76     if (MmLargePageDriverBufferLength == 0xFFFFFFFF) return;
  77
  78     /* Loop from start to finish */
  79     p = MmLargePageDriverBuffer;
  80     pp = MmLargePageDriverBuffer + (MmLargePageDriverBufferLength / sizeof(WCHAR));
  81     while (p < pp)
  82     {
  83         /* Skip whitespaces */
  84         if ((*p == L' ') || (*p == L'\n') || (*p == L'\r') || (*p == L'\t'))
  85         {
  86             /* Skip the character */
  87             p++;
  88             continue;
  89         }
  90
  91         /* A star means everything */
  92         if (*p == L'*')
  93         {
  94             /* No need to keep going */
  95             MiLargePageAllDrivers = TRUE;
  96             break;
  97         }
  98
  99         DPRINT1("Large page drivers not supported\n");
 100         ASSERT(FALSE);
 101     }
 102 }
 103
 104 /* EOF */